Pbocess of making habd-bubbeb abticles



H. WEIDA;

PROCESS OF MAKING HARD RUBBER ARTICLES.

APPLICATION FILED AUGJO, I9I5.

Patent-ed Aug. 15, 1916.

M 1 v D 1 //I/I/E/VTOH Harry Wezda,

/I TTOR/VEI/ WITNESS:

ran srarns rarnnr onrron HARRY WEIDA, OF HIGHLAND PARK, NEW JERSEY, ASSIGN OR TO THE TNDIA RUBBER COMPANY, A CORPORATION OF NEW JERSEY.

TROCESS MAKING ffARD-RU BIBER ARTICLES.

Specification of Letters Patent.

Application filed August 10, 191 5. Seria1 No. 44,681.

' To all whom it may conccrn."

Be it known that I, HARRY WEIDA, a citizen of the'United States, residing at Highland Park, in the countyof Middlesex, State of New Jersey, have invented certain new canization will be dispensed with.

- foil during vulcanization; Thus the mold In the manufacture of hard rubber articles it is customary to confine the same within rigid metal sections of a mold during v'ul canization. By my improved process the mold is used in connection with a plungerlike core in connection with a metallic foil envelop or casing to impart the desired shape to the article only, the article being unconfined as to its exterior except by the metallic will be used only to shape'the article prior to vulcanization and may be used over a great number of times in this capacity during the period which it has hitherto remained in the vulcanizer, and therefore the cost of production of articles by this method is materially reduced.

The inventioncan be readily understood from the following description taken in connection with the accompanying drawing, in which Figure l is a view in elevation of a sec tion of a rubber mold; Fig. '2 is a view in elevation showing the material being shaped into the desired formg'Fig. 3 is a view in elevation showing the material sha ed into the desired form; Fig. 4 is a view in elevation of the plunger-like core with the article supported on the outside by tinfoil ready for vulcanization. V y

Referring now to the drawing in which like characters of reference designate similar parts, 10 designates a rigid section of a Y metal mold, the complete mold comprising two counterpart sections similar to the one shown. Thesections are connected together by suitable connectors-1 11 passed through openings 11 in both sections. Each section is formed with a longitudinal groove ;,12 which communicates .with an enlarged of the mold coact to receive a cylindrical plunger-like core 14: and the grooves 13 coact in forming a cylindrical chamber of greater-diameter than the core and of suiticlent diameter to receive a tinfoil envelop or caslng l5 and leave a space 16 between the casing and the plunger-like core as best shown in Fig. '2. The casing is of. less length than the chamber andthe endof the chamber is closed by a removable plug 17 rigid metal walls on all sides' The to of the casing is open to permit entrance 0 the plunger-like core and to permitii'nsertion of PatentedAug. 15, 1916.

a suflicient amount of material 18 from which the article is to be formed.

hard consistency during vulcanization, in

the present embodiment of the invention, the v the - material illustrated being that used for manufacture of fountain pen caps.

The material is inserted prior tothe insertion' of the plunger-like core and gravitates to the bottomof. the tin foil casing 15 where The material 18 is preferably of rubber compound of-such character as to take a i it accumulates as shown. The plunger-like core is then inserted and forced forwardly upon the material, .the pressure of the core causing the material to move backwardly nto the space 16 between'the core and caslng'until the same is completely filled as shown in Fig. 3. The mold sections are now opened and the plunger-like core with the formed article and-tinfoil casing adhering thereto is now removed and placedin the vulcanizer where it is subjected to a sufficient temperature for a sufficient period of time to effect the desired degree of vulcanization inthe article. The tinfoil casing serves to hold the shaped article inplace during the early stages of vulcanization when because of the heat the stock becomes mobile and non-selfsupporting. The casing is of sufficient rigidity to maintain its shape and hold the article in shape until the vulcanization has progressed sufliciently to carry the material past its plastic stage, that is, until the heat has acted sufficiently on the material to impart self-sustaining consistency to the material. -of the vulcanizing step-,.the tinfoil casing After completion,

:may be stripped from the article, whereupon a the article is slipped off from the end of; groove 13. The grooves 12 in both sectionsthe plunger. The article'thus producedwill 65 against which the end of the casing bears, the casing consequently, being confined by be found to exhibit a smooth exterior im parted by the smooth surface of the tinfoil. In the abovedescription, only 'tinfoil'has been mentioned as a material forformjng understood as desiring to protect their use.

the casing-'15, and for the production of fountain pen caps, the manufacture of which I have described as a typical example of my method, it is this material which I utilize. However, in manufacturing the many articles for the production of whlch this method is adapted, I may form the casings.

of any metallic foil having the necessary physical characteristics, and I WlSll to be What is claimed is:

1. The process of making rubber articles 1,1o5,11e v consisting of shapingthe material upon a core within a metallic foil envelop having the configuration of the article to be formed, and subsequently vulcanizing the article supported upon the interior by said core and metallic foil casing rigidly confined 'from the outside, and subsequently vulcanizing' the material While supported upon said core, and confined upon the outside by said casing. Signed at New Brunswick, N. J this 4th day of August 1915.

. HARRY WEIDA. 

